I used the deli pepper jack cheese like many had recommended. I also noticed that people thought that this tasted too bland. Adding a can of tomatoes and chiles (Rotel) brought more flavor. This also makes it taste a little bit more like restaurant cheese sauce at the local Mexican restaurants. My husband and I were very impressed. This is probably as good as we are going to get with a Mexican cheese dip. For another idea adding a box of frozen spinach (squeeze the juice out) would make a great espinaca dip.